This document discusses baffles in shell and tube heat exchangers. It begins with an introduction that defines baffles as diverting flow across tube bundles to improve heat transfer and provide structural support to tubes. It then describes the main types of baffles as segmental, orifice, disc and doughnut, and rod baffles. The document also discusses baffle cuts, spacing, and the aims of thermal design, and provides references for further information.

1. INTRODUCTION TO
BAFFLES
Praveen Kumar( Roll no.T17ME006)
DEPARTMENT OF MECHANICAL ENGINEERINGDEPARTMENT OF MECHANICAL ENGINEERING
NATIONAL INSTITUTE OF TECHNOLOGY MEGHALAYANATIONAL INSTITUTE OF TECHNOLOGY MEGHALAYA1

2. CONTENTS
 Introduction
 Types of Baffles
 Baffle cut
 Baffle spacing
 Aims of thermal design
 References
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3. INTRODUCTION
 Baffles serve two purposes:
 Divert (direct) the flow across the bundle to obtain a
higher heat transfer coefficient.
 Support the tubes for structural rigidity, preventing tube
vibration and sagging.
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4. TYPES OF BAFFLES
 Segmental type:
Single – horizontal & vertical
Double
Triple
No-Tubes in Window
 Orifice type
 Disc and doughnut type
 Rod type
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5. Shell side Flow out
Tube side Flow
In
Tube
Bundle
SINGLE SEGMENTAL BAFFLE- Horizontal
Tube side flow out
Shell side flow in
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NIT MEGHALAYA DEPARTMENT OF MECHANICAL ENGINEERING

6. Shell Outlet
Channel
Inlet
Channel
Outlet
Shell Outlet
SINGLE SEGMENTAL
BAFFLES - Vertical6
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7. Shell Outlet
Shell Inlet
DOUBLE SEGMENTAL TRANSVERSE
BAFFLES7
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8. DOUGHNUT AND DISC TYPE
BAFFLES8
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9. 9
ORIFICE AND ROD TYPE BAFFLES
NIT MEGHALAYA DEPARTMENT OF MECHANICAL ENGINEERING
Rod baffleOrifice type baffle
(International Journal of Scientific & Engineering Research,2014)

10. BAFFLE CUT
 Height of the segment that is cut in a baffle to permit the
shell- side fluid to flow across the baffle.
 Baffle cut should be set carefully because a baffle cut that
is either too large or too small can increase the
possibility of fouling in the shell.
 Orientation:
Horizontal for heating or cooling with no phase change
Vertical for shell side condensation
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11.  CUT:
 15 % to 45 % of shell ID for Single Segmental
 25 % to 35 % of shell ID for Double Segmental
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(http://chemical-eng-world.blogspot.in/2013/05/baffles.html)
Last accessed on 15/03/2018
NIT MEGHALAYA DEPARTMENT OF MECHANICAL ENGINEERING

12. 12 (http://chemical-eng-world.blogspot.in/2013/05/baffles.html)
NIT MEGHALAYA DEPARTMENT OF MECHANICAL ENGINEERING

13. BAFFLE SPACING
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(Chemical engineering world)
Last accessed on 15/03/1018
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14. AIMS OF THERMAL DESIGN
 Achieve the specified duty at minimum overall cost
 To achieve high heat transfer coefficient within allowable
pressure drops.
 10-20 % Overdesign margin (design safety)
 Pressure drops should be in limit.
 To keep fluid velocities in limit.
 To keep shell side flow fractions in limit.
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15. REFERENCES
 Sadik Kakaç & Hongtan Liu (2002). Heat transfer enhancement of heat exchangers
Design (2nd ed.). Series :E applied science vol. 355. CRC Press. ISBN 0-7923-5637-63.
 Design of helical baffle in shell and tube heat exchanger and comparing with segmental
baffle using kern method, Dr. B. Jayachandriah and V. Vinay kumar, International
journal of emerging technology in computer science an electronics(IJETCSE).
ISSN:0976-1353 volume 13 issue 2- March 2015.
 Ferhad Tehar Nemati, Kazem Razmi, Reza Tasouji Azar, Sirous Zeyninejad Movassag ,
 Baffle space impact on the performance of helical baffle shell and tube heat
exchangers, vol. 44, pages 143-149, November 2012.
 Chemical engineering world, www.chemical-eng-world.blogspot.in/2013/05/baffles.html
 E-Learning, www.elearning.teknik.univpancasila.ac.id/course/index.php?categoryid=9
 International Journal of Scientific & Engineering Research, Volume 5, Issue 7, July-
2014 1186. ISSN 2229-5518.
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16. THANK YOU
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